Nonpoint
Sources of Pollution

Information on nonpoint source (NPS) pollution, which unlike pollution
from industrial and sewage treatment plants, comes from many diffuse
sources. NPS pollution is caused by rainfall or snowmelt moving
over and through the ground. As the runoff moves, it picks up and
carries away natural and human-made pollutants, finally depositing
them into lakes, rivers, wetlands, coastal waters, and even our
underground sources of drinking water.